<template>
    <div class="login-container">
        <el-form
            ref="loginForm"
            :model="loginForm"
            :rules="loginRules"
            class="login-form"
            auto-complete="on"
            label-position="left"
        >
            <div class="title-container">
                <h3 class="title">个人空间后台系统</h3>
            </div>

            <el-form-item prop="loginId">
                <span class="svg-container">
                    <svg-icon icon-class="user" />
                </span>
                <el-input
                    ref="loginId"
                    v-model="loginForm.loginId"
                    placeholder="请输入管理员账号"
                    name="loginId"
                    type="text"
                    tabindex="1"
                    auto-complete="on"
                />
            </el-form-item>

            <el-form-item prop="loginPwd">
                <span class="svg-container">
                    <svg-icon icon-class="password" />
                </span>
                <el-input
                    :key="passwordType"
                    ref="password"
                    v-model="loginForm.loginPwd"
                    :type="passwordType"
                    placeholder="请输入管理员密码"
                    name="password"
                    tabindex="2"
                    auto-complete="on"
                    @keyup.enter.native="handleLogin"
                />
                <span class="show-pwd" @click="showPwd">
                    <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
                </span>
            </el-form-item>

            <!-- 验证码 -->
            <div class="captchaContainer">
                <el-form-item prop="captcha" class="captchaInput">
                    <span class="svg-container">
                        <svg-icon icon-class="nested" />
                    </span>
                    <el-input
                        ref="captcha"
                        v-model="loginForm.captcha"
                        placeholder="请输入验证码"
                        name="captcha"
                        tabindex="3"
                        auto-complete="on"
                        @keyup.enter.native="handleLogin"
                    />
                </el-form-item>
                <div class="captchaImg" @click="getCaptchaFunc" v-html="svg"></div>
            </div>
            <el-form-item class="message">
                <el-checkbox v-model="loginForm.checked"> 7天内免登录 </el-checkbox>
            </el-form-item>
            <el-button
                :loading="loading"
                type="primary"
                style="width: 100%; margin-bottom: 30px"
                @click.native.prevent="handleLogin"
            >
                登录
            </el-button>
        </el-form>
    </div>
</template>

<script>
import { validUsername } from "@/utils/validate"
import { getCaptcha } from "@/api/captcha"

export default {
    name: "Login",
    data() {
        const validateUsername = (rule, value, callback) => {
            if (!validUsername(value)) {
                callback(new Error("请输入正确的管理员账号"))
            } else {
                callback()
            }
        }
        const validatePassword = (rule, value, callback) => {
            if (value.length < 6 || value.length > 16) {
                callback(new Error("密码长度需要在6~16位之间"))
            } else {
                callback()
            }
        }
        const validateCaptcha = (rule, value, callback) => {
            if (value.length === 0 || value.length > 4) {
                callback(new Error("请输入正确的验证码"))
            } else {
                callback()
            }
        }
        return {
            loginForm: {
                loginId: "admin",
                loginPwd: "123123",
                captcha: "",
                checked: false // 免登录checkbox的v-model
            },
            loginRules: {
                loginId: [{ required: true, trigger: "blur", validator: validateUsername }],
                loginPwd: [{ required: true, trigger: "blur", validator: validatePassword }],
                captcha: [{ required: true, trigger: "blur", validator: validateCaptcha }]
            },
            loading: false,
            passwordType: "password",
            redirect: undefined,
            svg: ""
        }
    },
    watch: {
        $route: {
            handler: function (route) {
                this.redirect = route.query && route.query.redirect
            },
            immediate: true
        }
    },
    created() {
        // 一进来就从服务器获取验证码
        this.getCaptchaFunc()
    },
    methods: {
        // 点击眼睛切换状态
        showPwd() {
            if (this.passwordType === "password") {
                this.passwordType = ""
            } else {
                this.passwordType = "password"
            }
            this.$nextTick(() => {
                this.$refs.password.focus()
            })
        },
        // 登录按钮方法
        handleLogin() {
            this.$refs.loginForm.validate((valid) => {
                if (valid) {
                    // 进入该代码块，说明表单验证通过
                    this.loading = true
                    this.$store
                        .dispatch("user/login", {
                            ...this.loginForm,
                            callback: () => {
                                this.getCaptchaFunc()
                            }
                        })
                        .then(() => {
                            this.$router.push({ path: this.redirect || "/" })
                            this.loading = false
                        })
                        .catch((err) => {
                            if (typeof err === "string") {
                                this.$message.error(JSON.parse(err).msg)
                            } else {
                                this.$message.error("用户名或密码错误")
                            }
                            this.loading = false
                        })
                } else {
                    this.$message.error("提交错误，请检查用户名和密码以及验证码是否输入正确")
                    return false
                }
            })
        },
        // 更新验证码
        async getCaptchaFunc() {
            const res = await getCaptcha()
            this.svg = res
        }
    }
}
</script>

<style lang="scss">
$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
    .login-container .el-input input {
        color: $cursor;
    }
}

/* reset element-ui css */
.login-container {
    .el-input {
        display: inline-block;
        height: 47px;
        width: 85%;

        input {
            background: transparent;
            border: 0px;
            -webkit-appearance: none;
            border-radius: 0px;
            padding: 12px 5px 12px 15px;
            color: $light_gray;
            height: 47px;
            caret-color: $cursor;

            &:-webkit-autofill {
                box-shadow: 0 0 0px 1000px $bg inset !important;
                -webkit-text-fill-color: $cursor !important;
            }
        }
    }

    .el-form-item {
        border: 1px solid rgba(255, 255, 255, 0.1);
        background: rgba(0, 0, 0, 0.1);
        border-radius: 5px;
        color: #454545;
    }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
    min-height: 100%;
    width: 100%;
    background-color: $bg;
    overflow: hidden;

    .login-form {
        position: relative;
        width: 520px;
        max-width: 100%;
        padding: 160px 35px 0;
        margin: 0 auto;
        overflow: hidden;
    }

    .svg-container {
        padding: 6px 5px 6px 15px;
        color: $dark_gray;
        vertical-align: middle;
        width: 30px;
        display: inline-block;
    }

    .title-container {
        position: relative;

        .title {
            font-size: 26px;
            color: $light_gray;
            margin: 0px auto 40px auto;
            text-align: center;
            font-weight: bold;
        }
    }

    .show-pwd {
        position: absolute;
        right: 10px;
        top: 7px;
        font-size: 16px;
        color: $dark_gray;
        cursor: pointer;
        user-select: none;
    }
}

.captchaInput {
    width: 70%;
}
.captchaContainer {
    display: flex;
}
.captchaImg {
    width: 150px;
    height: 54px;
    margin-left: 5px;
    cursor: pointer;
}
.message {
    color: $light_gray;
    border: none;
    background-color: transparent;
    margin-top: -10px;
    margin-bottom: 0px;
}
</style>
